Train control system



Oct. 10, 1933. L JQNES TRAIN CONTROL SYSTEM Filed Oct. 23. 1926 2Sheets-Sheet l NVENTOR Lesier .Jones BY ng wm @v mm wwwa mums.

ATTORNEYS Oct. 10, 1933. L l.. JoNl-:s

TRAIN CONTROL SYSTEM 2 Sheets-Sheet 2 Filed 0G12. 23. 1926 DAME v/ mPatented Oct. 10, 1933 TRAIN CONTROL SYSTEM Lester L. Jones, Oradell, N.J.

Application October 23,

71 Claims.

This invention relates to train control systems, and has specialreference to the provision of an improved train control system of theinduction type.

A prime desideratum of my present invention relates to the provision ofa train control system of the induction type embodying cooperatingvehicle carried and roadside inductors in which an activating conditionmay be produced in the vehicle carried inductor to effect some activeoperation of the train control apparatus by the movement or positioningof said vehicle carried inductor relatively to a roadside inductoremploying circuit means devoid of an energy source. In prior inductiontrain control systems of which I am aware, the activating operation ofthe vehicle carried circuits was produced by the transmission of anactivating or energizing inuence from the roadside inductor to thevehicle carried inductor 2 9 obtained by energizing the roadsideinductor either directly by means of a source of energy located on theroadside or indirectly by locating the source of energy on the movingvehicle and reflexing or retransferring said energy through cooperatingvehicle carried and roadside inductors from the vehicle to and throughthe roadside inductors and back to the vehicle apparatus. By my presentinvention I propose to eliminate the principal objections to thesesystems of prior design, which objections have their origin either inthe necessity of using roadside energy for the roadside inductors or inthe necessity of using a multiplicity of inductors for reiiexing energywhere the source of energy is located on the vehicle.

A corollary prime object of my present invention relates to theprovision of an improved induction train control system in which asingle roadside inductor may be employed and selectively operated toproduce in a vehicle carried inductor means a number of operationscorresponding to the conditions of the roadside, which operationscomprise the production of a condition in the vehicle carried inductormeans to produce a tripping or train control stopping operation in thetrain control apparatus or/ and a condition in the vehicle carriedinductor means to permit a passive state in the vehicle carriedapparatus, that is, to permit the vehicle to pass a roadside controllingstation Without any operation being produced in the vehicle carriedapparatus combined with a tlrd condition producible in the vehiclecarried inductor means for eifecting a resetting operation of thevehicle carried apparatus in response, for example, to a Clear or 1926.Serial No. 143,608

caution roadside condition. A further prime object of my presentinvention relates to the provision of an induction system of thischaracter capable of producing the clear or caution operating conditionsin the vehicle carried appax ratus by means of a roadside inductordevoid of a source of energy, the results attained being thereforecapable of being produced with the use of a single inductor controlledby circuit means devoid of a roadside energy source.

Other principal objects of my invention will become evident as thedescription proceeds, and to the accomplishment of the foregoing. andsuch other objects as will hereinafter appear, my invention consists inthe elements and their relation one to the other in circuit combinationsas hereinafter more particularly described and sought to be defined inthe claims; reference being had to the accompanying drawings which showthe preferred embodiment of my invention, and in which:

Fig. l is a wiring diagrammatic View of a train control system embodyingthe principles of my invention and showing the cooperation between thevehicle carried and roadside inductors 80 for producing the traincontrol operations, and

Fig. 2 is a wiring diagrammatic view of the circuits immediatelycontrolling and being controlled by the cooperative vehicle carried androadside inductors, more speciiically depicting A the physical relationsbetween 'the circuits and the principles employed therein.

Referring now more in detail to the drawings, I will make referencefirst to Fig. 2 thereof to explain the elements, the combination ofelements and the underlying principles of a train control systemembodying my invention, after which I will have reference to `Fig. 1ofthe rawings and describe the use of the combined elements inassociation with train control circuits for producing the train controloperations.

Referring therefore first to Fig, 2 of the drawings, the vehicle carriedand roadside inductors comprise respectively a vehicle carried inductormeans generally designated Aas AA and a track in- 100 ductor generallydesignated as B over which the vehicle inductor is movable inthemovement of the vehicle over the roadside, the said vehicle inductor Acomprising inductively coupled primary and secondary coilsr p and srespectively, both preferably wound on laminated cores 10 and 11respectively and having a relation such as is described and claimed inthe copending application of A. G.,Shaver, Serial No. 596,595, filedOct. l0, 1921. The primary coil p isconnected to an H normally, that is,when the vehicle carried alternating current source of energy 13designated as 360- by means of a primary circuit a which is generallydesignated in Fig. 2 of the drawings by the legend Primary, the saidprimary coil p preferably including a second winding 14 wound over thecore of the secondary coil s in opposite sense thereto, the said winding14 constituting a buckdown winding for producing a neutralization ofresidual flux in the secondary Vcoil s under certain conditions ofoperation, as is described and claimed in the patent to A. G. Shaver1,521,332 of December 30, 1924. The track inductor B comprises a trackcoil t also preferably wound over a laminated core 15 and a circuit b ofwhich the track coil t preferably forms a part, the said circuit b beingdevoid of any energy source.

As is described in the aforementioned copending applications, as well asin the patent toV A. G. Shaver No. 1,521,332 for Shunting or tripdevice, patented Dec. 30, 1924, when the vehicle transformer inductor Acovers an'inert track element part and resulting in a consequenteffective de- `energization of the device 16, with the result that anyapparatus such as the armatures controlled thereby are opened fortripping other train control circuits. It will be understood that1ninthe the the ductor A is not in position over the track ductor B, thetransferrence of flux from primary coil p to the secondary coil s ofvehicle inductor A energizes the device 16 in secondary circuit c.

I have discovered that when the engine or vehicle carried inductor Amoves or is positioned over a track inductor such as B, either inert orprovided with a circuit b short-circuited or tuned, that not only doesthe power supplied by the alternating current source of energy 13 to theprimary coil p of the vehicle carried inductor change, but that markedchanges are produced in qthe phase angle between the current` andvoltage effective on said primary inductor coil.

I have further found that these produced phase changes may beeffectively applied in operating controlling circuits on the vehicle andin producing activating operations thereof by means of suchshort-circuited or tuned track inductor circuit without the use of anyroadside energy source. I have empirically determined that suchcontrolling circuits may be very effectively governed by the employmentof a relay 12 designated in Fig. 2 by the legend Reset relay located inthe primary circuit a, the said relay being a two-element relay havingits elements so disposed in the primary circuit as to eirciently respondto the phase changes as well as the power change produced in the vehiclecarried inductor in the cooperation of the latter with the roadsideinductor circuit. This reset relay Ycomprises in the preferredconstruction armature and field coils 17 and 18 designated by thelegends Armature and Field in Fig. 2, the field coil being preferablyarranged in series with Aand the armature coil being preferably arrangedin parallel to the primary coil p of the vehicle carried inductor.

I have found that the constants of the armature and field circuits maybe so selected as to produce a no relay torque for some one trackcondition and positive or negative torques of different magnitudes forother track conditions. More specifically, I have determined that theresistance and reactance of the Vehicle carried primary inductor p maybeso related to the relay armature circuit reactance and resistance asto produce the desired results. For each track condition the impedanceof the primary inductor p may be represented by resistance and reactancefactors, the reactance factor being usually though not necessarilyinductive; and both resistance and reactance factors vary markedlydepending upon the track condition. For the condition of no torque inthe relay, I have determined that the quotient of the resistance and thereactance of the primary inductor should equal the quotient of thearmature circuit reactance divided by the resistance, this beingmathematically represented as:

where Slight corrections to this are. necessary for no the relayarmature inductive reactances, and for small voltages which may beinduced in the relay armature coil from its field.

To produce the desired constants, the arma-ture 17 of the relay 12 isconnected across the current 51,15 supply source through suitableresistance and capacitanceproduced by a resistor Rp and acondenser Carranged in the iin-parallel circuit of the armature 17, these being theresistance and capacity factors embodied in the foregoing equa- '.1'20tion. Y

Normally with this circuit arrangement described and with the preferredselected constants thereof, the currents in the armature andV field 17and 18 of the relay 12 are phased 90 electrical 51?25 degrees apart,producing a no torque condition in the relay so that an armature element19 controlled bythe armature coil 17 is heldin a neu- Vtrai position asshown in Fig. 2 of the drawings.

However, when the vehicle carried inductor'A'O moves over the trackinductor B with the track side circuit b short-circuited or tuned in aman'- ner to be described presently, the change in the power supplied tothe primary coilp, together with the shift inthe phase angle between thecurrentand voltage eifective thereon, produces a marked shift in thephase between the armature and eld currents of the relay 12'producing achange in the relay torque from no torque to either a positive ornegative torque of' different 140 magnitudes, depending upon thecharacteristic of the roadside circuit b. The phase shift'and powerchange are different when the vehicle carried inductor is in cooperationwith a short-cirl Y cuited track inductor than when it is in cooperationwith a tuned track inductor, and hence it becomes possibletodiscriminate between the effects on the relay 12 in accordance withdiiferent conditions, as for example clear or caution roadsideconditions. The number of indications produced in the relay 16 may befurther extended by tuning the track circuit to values above or belowresonance so as to produce sharp changes in the vehicle carried inductorprimary currents lagging or leading the applied primary voltage. Thesechanges may be made more critical or pronounced by tuning the enginepower supply circuit as by means of a series condenser 20 arranged inthe primary circuit a and designated in Fig. 2 by the legend Supplycircuit tuning or power factor changer.

To produce a variety of indications in the vehicle carried inductorsystem as described, the track inductor circuit b comprises a movablecontact 21 movable over a series of taps 22, 23, 24 and 25,' movement ofthe contact 21 on the tap 22; producing a short-circuited inductorcircuit, movement of the contact 2l on the tap 23 introducing a capacityin the circuit b by means of the condenser 26 and movement of thecontact 21 on the tap 24 introducing a different condenser 27 in saidcircuit b. The condensers 26 and 27 may be of the desired values toeither tune the circuit b to resonance to the frequency of the vehiclecarried alternating source 13, or circuit b may be tuned above or belowsuch resonance point to produce the lagging or leading primary currentsdescribed. As applied to the vehicle carried-circuit shown in Fig. 2, Imay merely employ the taps 24 and 25 or said taps 24 and 25 incombination with the tap 22, the tap 25 being employed to open the trackcircuit b to produce a deenergizing operation of the vehicle carriedrelay 16, the tap 22 or 24 being employable for permitting the vehiclecarried apparatus to move over` the roadside apparatus without changeand the tap 24 being employablo for introducing the tuned tracksidecircuit to produce an activating condition in the vehicle inductor A tooperate the relay 1.2 from the no torque to the maximum torque position,these operations corresponding respectively to dangerr position, to a Ylear passive position and to a clear active or resetting position.

To produce the most efficient results, the constants and thecharacteristics of the circuits must be suitably selected anddetermined, and I have found that the following considerations are ofimportance.

The torque operating the relay 12 is related to the phase angle changebetween current and voltage in the engine primary inductor as well asthe percentage change of power input into the primary of the vehiclecarried inductor due to the cooperation of the same with the tuned trackinductor. It will be apparent that Where the normal power input is aminimum and the power abstracted by the track tuned circuit is amaximum, the percentage change of power is greatest.

The A. C. supply circuit 13 should have considerable inductance both forthe magnetic field of the engine inductor and for the neld of the resetrelay, this inductance at 360 cycles giving considerable reactance tothe generator or primary circuit. A phase compensator is thereforedesirable in this A. C. supply circuit to facilitate the introduction ofsufficient power to the engine inductor. Without such a phasecompensator the generator E. M. F. would. be greater, thus requiring alarger A. C. generator. For this purpose, therefore, the tuningcondenser 20 heretofore referred to is supplied, and this condenser isadjustedY to approximately neutralize the inductive reactance of theprimary circuit, thushpermitting the flow of a large magnetizing currentwith a relatively small driving E. M. F.

In Connection with the adjustment of uns phase compensating condenser20, I prefer to set it so that the resonant frequency of the primarycircuit a is normally somewhat higher than the frequency of thegenerator or A..C. source 13, this for the purpose of causing theprimary circuit a to stabilize the speed of the generator. This isimportant because the proper operation of the reset relay depends uponthe coincidence of gen# the primary circuit, increasing the current flown therein, and thereby the power input to the inductor. This produces anadditional load thrown on the generator which tends to reduce its speed.Conversely a tendency towards lower speed on the generator due, forexample, to a drop in steam pressure, results in a diminished load onthe generator which tends to check the speed reduction. The importanceof this frequency relationship between the generator and the primarycircuit a is emphasized by considering the result of reversing therelation. In the case of making the primary circuit resonant to afrequency lower rather than higher than the generator frequency, lowsteam pressure would reduce the generator speed, slightly causing anincrease in load and thereby a further speed drop, etc.

The secondary circuit c is also preferably tuned as by means of acondenser 27 designated by the legend Tuning condenser in Fig. 2. Thepurpose of the tuning of the secondary circuit c is primarily toneutralize the inductive reactance of the circuit so as to permit alarger flow o-f current therein with more magnetic flux to operate therelay 12. The inductance changes of the trip relay circuit due toinductance change in the engine inductor resulting fromcooperation withthe track inductor are relatively small and contribute little to thedrop in the current of the relay 16 when passing over an open trackinductor. For example, I have found that the engine inductor inductancechange is less than 10%. This results in a change of less than 5% in thecircuit inductance of the secondary circuit c because the eiiiciencyrelations demand that the trip relay have approximately the sameinductance as its` supply source. The secondary circuit frequency changeis therefore less than 21/2%, and this change could not be relied uponfor operating the relay 16, since the normal speedregulation of thesupply generator is only of this order of magnitude. Operation of thisrelay 16 in the secondary circuit therefore depends primarily upon areduction of the driving E. lVI. F. in the transformer secondary whenpassing over an open circuited track inductor.

Now it is important that the normal current of the secondary relay 16 befairly constant under all normal variations of generator frequency. Asdescribed above, the primary current varies with the generator frequencyand a corresponding variation of E. M. F. in the secondary circuit ,cresults. In order to hold the current in the relay 16 of this circuitapproximately constant through kill these conditions, I find itpreferable to adjust the resonant frequency of the secondary circuit cto a value slightly lower than the normal, generator frequency. Thenwhen the generator speed.drops, causing a reduction of primary currentand a of the generator frequency to the frequency of the secondarycircuit c. This reactance drop tends toneutralize the effect of the dropof` induced voltage and thereby maintains the current of the relay 16more nearly constant. Conversely when the generator overspeeds, theincreased pri. maryr current causes an increase in secondary E. M. F. Noincrease of current of the relay 16 results, however, due to the higherreactanceI of the secondary circuit c for this higher generatorfrequency.

Itwill be apparent that theelements of my invention thus iar describedmay be employedV singly or in combination. Thus it will be evident thatthe primary circuit a may be employed in combination withA the trackinductor without the use of the secondary circuit c to produce thecharacteristic operations of the relay 12. It will be further apparentthat the physical. phenomena,

occurring by the cooperation of such a primary circuit with the trackinductor circuit may be em-` ployed for variously operating the traincontrol relays. When the primary circuit a. is used in combination withthe secondary circuit c for selectively operating a number of relays, itWillbe further apparent that various combinations may, be produced andvarious operations efected'without departing fromthe spirit of theinvention as dened in the hereinafter appended claims. In applying theinvention, therefore, to the` train control circuit arrangemnt about tobe described, I desire it to be understood that such description isgiven by way of explanation of one of the preferred ways of employingthey principles of the invention, and not by way of limitation.

In the train control system exemplified, the relay 16 is employed as atrip relay for operating a train control circuit d and the relay12 isemployed as a reset relay for operating a train control circuit e toreset the operation of the vehicle carried apparatus after the same hasbeen tripped. Where the cooperation of the trip and reset circuits issuch as to weaken the trip relay during reset relay operation or anypart of the latter, I preferably employ a means for controlling theresetv relay 12 to delay the release thereof, it being understood f.thatv the normal operation of the reset relay 12 to an activatingcondition takes place only during the time or cooperation between thevehicle carried inductor A and roadside inductor B. Thisy means to delaythe release of the reset relay carries the condition of the reset relayover any mechanicalor electrical transients which may be due to thespeed of action required ofY the parts in high speed train operation orover any valleys in the curve of operation of the track inductor l whichmay. be. due to a reversal of E. M. F; in

the track inductor. The release controlling means may be associated withthe reset .or trip relays, and in the preferred construction, as shownin Fig; 2, the same is associated'with the resetrelay 12. comprises aslow release magnet 28 controlling the armature element 19 of the resetrelay, the said magnetv 28 receiving energy from a D. C. source 29through a circuitV comprising a conductor 30, a

f slow release controller generally designatedas 31,

Preferably this release controlling means a conductor 32, magnet 28,conductor 33, contacts 34 normally open but closed when the armature 19is actuated under reset conditions,` and conductor 35.

The slow release controller 31 comprises a vessel having a body.ofmercury 36 therein, into which extends, in the branch 31 of the Vessel31, a, wire heater 37 preferably made of nickel having a contact 38.atthe bottom end thereof, the conductor 30 having a lead 30' extendinginto the mercury body in the other branch 312 of the vessel 31. Withthis construction when the armature of the reset relay is operated toclose the contacts 34 and the magnet 28 is energized to vhold the resetrelay armature in its actuated position, the closing of the circuitvthrough the slow releasev controller heats. the heater 37, causing anexpansion of air inthe heater chamber 31 of the vessel which causes themercury body 36 to move into the air chamber `312 ofthe vessel 31,suchmovement after a predeterminedtime breaking the connectionbetweenthe mercury body and the heater contact 38, such breaking ofconnection causing a deenergization of the magnet. 28v and a consequentrelease ofthe armature reset relay.

Now referring to Fig. 1 of the drawings, I show the controlling circuitsof Fig. 2 applied'for operating other train control elements toproducethe 'tripping and resetting operations. In Fig. l the circuits of Fig. 2are reproduced by parts bearing similar reference characters, someparts, however, such as the relays 16 and 28 being representedVdiagrammatically, the reset relay 12 being shown Withtwo field-coils 18on opposite sides of` the armature coil 17. The other parts are allsimilar with the exception that the D. C. energy source 29 isrepresented by a generator instead of a battery and the contacts 34 areseparated into three independent contacts 34', 342 and 343.

The mechanism or circuits operated by the controlled circuits d and eare substantially the same as those describedand claimed in thecopending application ofA Shaver and Maisel Ser. No. 138,869, filed Oct.1, 1926, for Train control system; and in the present disclosure I showthe manner in which such circuits control-the operation oftranslatingrelays 40 and 41.

The trip circuit alv derives its energy from a potentiometer 42connected to the mains of the generator 29 byfmeans of conductors 43 and44, the trip circuit being traced from the positive side ofpotentiometer 42, conductor 45, trip contact 46, conductor 47, amanually operable switch 48, conductor 49 having a rst branch throughthe relay magnet 41fby way of conductors 50 and 51, stick Contact 52,and having the second branch through the relay magnet 40 by way ofconductors 53 and 54 and stick contact 55, both branches joining inthecommon conductor 56 and conductor 57 back. to a negative point. ofthe potentiometer 42. These relays 40` and 41 are therefore normallyenergized through the two stickcircuits traced and closed at the tripcontact 46. When the vehicle carried inductor A moves over anopen-circuited track inductor B, the trip relay 16 is effectivelydeenergized, opening the trip contact 46 resulting in the opening of thestick circuits traced, with the consequent persistent deenergzation ofthe relay magnets 40 and 41. Also when the vehicle carried inductor Amoves over a short-crcuitedtrack inductor B, the trip relay contact 46Willbe maintained in closed condition unaffecting the operation of therelay magnets 40 and 41.

The resetcircuit. e isemployed for resetting 150 the relay magnets 40and 41 when the reset relay 12 is operated. For operating both magnets40 and 41, I employ two reset contacts 34' and 342 as hereinabovestated. These reset circuits may be traced from the positive side ofenergy potentiometer 42, conductor 45, trip contact 46 (closed duringthe movement of vehicle carried inductor A over a closed or tunedtrackside circuit inductor B) conductor 47, manually operable switch 48,conductor 49, a rst branch going through conductor 50, magnet 41,conductor 58, contact 342, conductor 59 to conductor 57 and energysource 42, a second branch of the circuit going through conductor 53 andmagnet 40, conductor 60, contact 34', joining the first branch atconductor 59 to conductor 57 and potentiometer energy source 42. Theclosing of the contacts 34 and 342 by the reset relay, althoughmomentary or for a limited time where delaying means is employed asdescribed, causes the 're-closing of the stick circuits for the magnets4i) and 41 since the trip contact 46 is closed and maintained closed,and thus a persisting resetting operation is effected.

The third reset contact 343 is employed for the circuit of the delayingmeans or slow release controller 31, which circuit corresponds to thatheretofore traced for Fig. 2 and comprises similar parts including theconductor 30 connected to the plus side of the energy source, thecontroller 31, the conductor 32, the slow release magnet 28, conductor33, the contact 343, and conductor 35 back to the other side of theenergy source.

The use and operation of the system embodying my invention and thenumerous advantages thereof will in the main be apparent from the abovedetailed description thereof. It will be further apparent that while Ihave shown and described my invention in the preferred forms, manychanges and modifications may be made in the structure disclosed withoutdeparting from the spirit of the invention, denned in the followingclaims.

I claim:

1. In combination, vehicle carried apparatus, a vehicle carried inductormeans operable for producing a resetting operation in said vehiclecarried apparatus, and a single roadside inductor cooperating with saidvehicle carried inductor means, said roadside inductor embodying a tunedcircuit devoid of an energy source and operative when closed foraffecting the vehicle carried inductor means to produce the resettingoperation thereof.

2. In combination, vehicle carried apparatus including a source ofenergy, a vehicle carried inductor means including inductively coupledcoils connected to said energy source and operable for producing aresetting operation in said vehicle carried apparatus, and a roadsideinductor means cooperating with said vehicle carried inductor means,said roadside inductor means including an inductor coil and a tunedcircuit therefor devoid of an energy source, said circuit beingoperative when closed for affecting the inductively coupled coils of thevehicle carried inductor means to produce the resetting operationthereof.

3. In combination, vehicle carried apparatus including an alternatingcurrent source of energy, a vehicle carried inductor means operatingthrough said energy source and operable for producing a resettingoperation in said vehicle carried apparatus, and a roadside inductorcooperating with said vehicle carried inductor means, said roadsideinductor embodying a tuned circuit devoid of an energy source andresonant substantially to the frequency of said alternating currentsource of energy, said circuit being operative when closed for affectingthe vehicle carried inductor means to produce the resetting operationthereof.

4. In combination, vehicle carried apparatus including an electricallyoperated device and an A. source of energy, a vehicle carried inductormeans including inductively coupled coils, one coil of which isconnected in circuit to the energy source, said circuit being tunedsubstantially to the frequency of A. C. source and said coils beingoperable for producing a resetting operation in said device, and aroadside inductor cooperating with said vehicle carried inductor means,said roadside inductor embodying an inductor coil and a circuit therefordevoid of an energy source, said roadside circuit being also tunedsubstantially to the frequency of the energy source and being operativewhen closed for aifecting the vehicle carried inductor means to producethe resetting operation thereof.

5. In combination, vehicle carried apparatus including a source ofenergy, a Vehicle carried inductor means energized from said vehiclesourcerof energy and operable for producing van energy resettingoperation in said vehicle carried apparatus, and a single roadsideinductor cooperating with said vehicle carried inductor means, saidroadside inductor embodying a tuned circuit devoid of an energy sourceand operative when closed for changing the energy 'relations in thevehicle carried inductor means to produce the resetting operationthereof.

6. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor means energized from said sourceof energy and operable for producing a resetting operation in saidvehicle carried apparatus, and a single roadside inductor cooperatingwith said vehicle carried inductor means, said roadside inductorembodying a circuit devoid of an energy source and operative when closedfor changing the phase relations of the current and voltage eiiective insaid vehicle carried inductor means for producing the resettingoperation thereof.

7. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor means energized from said sourcefor" energy and operable for producing a resetting operation in saidvehicle carried apparatus, and a roadside inductor cooperating with saidvehicle carrie-d inductor means, said roadside inductor embodying acircuit devoid of an energy source and operative when closed forchanging the phase relations of the current and voltage eifective insaid vehicle carried inductor means for producing the resettingoperation thereof.

8. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor means energized from said sourceof energy and operable for producing a resetting operation in saidvehicle carried apparatus, and a roadside inductor cooperating with saidvehicle carried inductor means, said roadside inductor embodying a tunedcircuit devoid of an energy source and made resonant substantially. tothe frequency of said energy source, said circuit being operative whenclosed for changing the phase relations of the current and voltageeffective in said vehicle carried inductor means for producing theresetting operation thereof.

9. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor connected in circuit to saidsource of energy and operable for producing a resetting operation insaid vehicle carried apparatus, said circuit being tuned, and a roadsideinductor cooperating With said vehicle carried inductor means, saidroadside inductor embodying a correspondingly tuned circuit devoid of anenergy source and operative When closed for changing the phase re- 5.95;an inductor coil and a tuned circuit therefor lations of the current andvoltage effective in said vehicle carried inductor means for producingthe resetting operation thereof.

10. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor means operating through saidenergy source and operable for normally holding said apparatus in a setcondition, and a roadside inductor cooperating with the vehicle carriedinductor means, said roadside inductor embodying a tuned circuit devoidof an energy source and made resonant to substantially the frequency ofsaid A. C. source, said circuit being selectively operable for producingeither a 'tripping or resetting operating condition in said vehiclecarried inductor means.

11. In combination, vehicle carried mechanism comprising an electricallyoperated device, a source of energy, andan inductor means operatingthrough said source of energy for controlling f; the operation of saiddevice and operative to nor- A comprising an electrically operateddevice, a

source of energy, and an inductor means including inductively coupledcoils operating through said source of energy for controlling theoperation of said device a'nd operative to normally hold said device ina set or Venergized state, and roadside mechanism comprising a roadsideinductor cooperating with said vehicle carried inductor means, saidroadside inductor embodying devoid of an energy source, said circuitbeing selectively operable i'or producing in the vehicle carriedinductively coupled ccils correspondingly selective conditions foreither tripping or resetj ting said electrically operated device.

" ergy and operative for normally holding said apparatus in a setcondition, and a roadside inductor cooperating with the vehicle carriedinductor means, said roadside inductor embodying a circuit devoid of anenergy source and operative 'i when open forproducing a trippingcondition in said vehicleV carried inductor means and operative whenclosed for changing the phase relations of the current and voltageeiective in said vehicle carried inductor means for producing the 1;resetting operating condition therein for operating said relay.

14. In combination, vehicle carried apparatus including an A. C. sourceof energy and a relay operable by phase changes, a vehicle carried in-"V' @l ductor means energized from said source of energy and operativefor normally holding said apparatus in a set condition, and a singleroadside inductor cooperating with the vehicle carried inductor means,said roadside inductor embodying a circuit devoid of an'energy sourceand operative When open for producing a tripping condition in saidvehicle carried inductor means and operative when closed for changingthe phase relations of the current and voltage eifective in said vehiclecarried inductor means for producing the resetting operating conditiontherein for operating said relay.

i5. In combination, vehicle carried apparatus including an A. C. sourceof energy and a relay operable by phase changes, a vehicle carriedinductor means comprising inductively coupled coils energized from saidsource of energy and operative for normally holding said apparatus in aset condition, and a single roadside inductor cooperating with theinductively coupled coils, said roadside inductor embodying a circuitdevoid of an energy source and operative when open for producing atripping condition in said vehicle carried inductor means and operativewhen closed for changing the phase relations of the current and voltageeffective in said vehicle carried inductor means for producing theresetting operating condition therein for operating said relay.

16. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor means including inductivelycoupled primary and secondary coils, the primary of Which is connectedin tuned circuit to said source of energy, said means being operativefor normally' holding said apparatus in a set condition, and a roadsideinductor cooperating With the vehicle carried inductor means, saidroadside inductor embodying a tuned circuit devoid of an energy sourceand operative when open for producing a tripping condition in saidvehicle carried inductor means and operative when closed for changingthe phase relations of the current and voltage eiiective in the primarycoil o1" said vehicle carried inductor means for producing the resettingoperating condition therein.

17. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit;and roadside mechanism comprising a roadside inductor arranged tocooperate with the vehicle carried inductor and a circuit for saidroadside inductor devoid of an energy source and operative when closedfor affecting the vehicle carried inductor to produce an operation ofthe said relay.

18.*In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having iield and armature coils arranged in said circuit,the eld and armature coils being respectively in series with and inparallel to said inductor, and roadside mechanism comprising a roadsideinductor arranged to cooperate with the vehicle carried inductor and acircuit for said roadside inductor devoid of an energy source andoperative when closed for aiiecting the vehicle carried inductor toproduce an operation of the said relay.

19. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and. a relay having field and armature coils arranged. in said circuit,the currents of the field and armature coils being phased 90 electricaldegrees apart to produce normally a no torque condition in said relay;and roadside mechanism comprising a roadside inductor arranged tocooperate with the vehicle carried inductor and a circuit for saidroadside inductor devoid of an energy source and operative when closedfor affecting the vehicle carried inductor to produce a phase shift ofthe currents in said field and armature coils and a consequent operationof the said relay.

20. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils controlled by said circuit,the currents of the field and armature coils being phased 90 electricaldegrees apart to produce normally a no torque conditionin said relay;and roadside mechanism comprising a roadside inductor arranged tocooperate With the vehicle carried inductor and a circuit for saidroadside inductor devoid of an energy source and operative when closedfor affecting the vehicle carried inductor to produce a phase shift ofthe currents in said field and armature coils and a consequent operationof the said relay.

2l. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy, atwo element relay controlled by said circuit, the quotient of theresistance and the reactance of said inductor being made substantiallyequal to the quotient of the circuit reactance and the resistance of oneof the elements of said relay; and roadside mechanism comprising aroadside in ductor arranged to cooperate with the vehicle carriedinductor and a circuit for said roadside inductor operative when closedfor affecting the vehicle carried inductor to produce an operation ofthe said relay.

22. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and

a relay having field and armature coils arranged in said circuit, thefield and armature coils being respectively in series With and inparallel to said inductor, the quotient of the resistance and thereactance of said inductor being made substantially equal to thequotient of the armature circuit reactance and the armature circuitresistance; and roadside mechanism comprising a roadside inductorarranged to cooperate with the vehicle carried inductor and a circuitfor said roadside inductor operative when closed for affecting thevehicle carried inductor to produce an operation of the said relay.

23. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit,the field and armature coils being respectively in series with and inparallel to said inductor, the quotient of the resistance and thereactance of said inductor being made substantially equal to thequotient of the armature circuit reactance and the armature circuitresistance; and roadside mechanism comprising a roadside inductorarranged to cooperate With the vehicle carried inductor and a circuitfor said roadside inductor devoid of an energy source and operative whenclosed for affecting the Vehicle carried inductor to produce anoperation of the said relay.

24. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay'having field and armature coils arranged in said circuit,said circuit being made resonant substantially to the frequency of saidA. C. source; and roadside mechanism comprising a roadside inductorarranged to cooperate with the vehicle carried inductor and a, circuitfor said roadside inductor devoid of an energy source and operative whenclosed for aiiecting the Vehicle carried inductor to produce anoperation of the said relay.

25. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit,said circuit being made resonant and having a resonant frequencysomewhat higher than the frequency of the A. C. source; and

roadside mechanism comprising a roadside inductor arranged to cooperatewith the vehicle carried inductor and a circuit for said roadsideinductor devoid or" an energy source and operative when closed foraffecting the vehicle carried inductor to produce an operation of thesaid relay.

26. In combination, vehicle carried apparatus comprising an A. C. source'of energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit,the field andarmature coils being respectively in series with and inparallel to said inductor, the quotient of the resistance and thereactance of said inductor being made substantially equal to thequotient of the armature circuit reactance and the armature circuitresistance; and roadside mechanism comprising a roadside inductorarranged to cooperate with the vehicle carried inductor and a tunedcircuit for said roadside inductor ldevoid of an energy source and maderesonant to the frequency of said A. C.

All05 source, said circuit being operative when closed for affecting thevehicle carried inductor to produce an operation of the said relay.

27. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy anda two-element relay in said circuit, one element of said relay being inseries with and the other element of said relay being in parallel to thesaid inductor.

28. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit,the field and armature coils being respectively in series with and inparallel to said inductor.

29. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy, atwo-element relay controlled by said circuit, one element of said relaybeing in series With and the other element of said relay being inparallel to the said inductor and the currents in said elements beingnormally phased 90 electrical degrees apart.

30. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a two-element relay controlled by said circuit, one element of saidrelay being in series With and the other element of said relay being in31.'In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a two-element relay in'said circuit, one ele- "ment of said relaybeing in series with and the other element of said relay being inparallel to the said inductor, the said series circuit being maderesonant to substantially the frequency of the A. C. source.

32. In combination, vehicle carried apparatus Acomprising an A. C.source of energy, an inductor connected in circuit to said source orenergy and "a two-element relay in said circuit, one element of saidrelay being in series with and the other element of vsaid relay being inparallel to the said inductor, the said series circuit being tuned andmade resonant to a frequency slightly higher than the frequency of theA. C.. source.

33. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and

.a relay having field and armature coils arranged in said circuit, thefield and armature coils being respectively in series with and inparallel to said inductor, the quotient of the resistance and thereactance of said inductor being substantially equal to the quotient ofthe armature circuit re- 'actance' and the armature circuit resistance.

34. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relayY having eldand armature coils arranged in saidcircuit, thefield and armature coils being respectively in series with and inparallel to said inductor and the currents in said eld and armaturecoils Vbeing normally phased 9G electrical degrees apart.

35. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy,and a relay having field and armature coils arranged in said circuit,the iield and armature coils being Vrespectively in series with and inparallel to said inductor, the said series circuit being tuned and maderesonant to a frequency slightly higher than the frequency of the A. C.source.

36. In combination, vehicle carrier apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary of'Which'is connected to said source of energy, a trip relay connected tothe secondary of said coils, "and a reset relay connected to the primaryof 'said coils; and roadside mechanism comprising a roadsideinductorarranged to cooperate With the inductively coupled coils of the vehiclecarried inductor and circuit means for said roadside inductor'selectively operable for producing in said vehicle carried coupledcoils either a condition to operate said trip relay or a condition tooperate said reset relay.

37. In combination,v vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected to said source Yof energy, a relay connected to thesecondary of said coils, and a second relay connected to the primary ofsaid coils, the said second relay having a field coil inA series Withand an armature coil in parallel to the primary inductor coil; androadside mechanism comprising a roadside inductor arranged to cooperateWith the inductively coupled coils of the vehicle carried inductor andcircuit means for said roadside Ainductor selectively operable forproducing in said vehicle carried coupled coils either a condition tooperate said rst relay or a condition to voperate said second relay.

38. In combination,. vehicle carried. apparatus comprising-a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected to said source of energy, a trip relay connected tothe secondary of said coils, and a reset relay connected to the primaryof said coils; and roadside mechanism comprising a roadside inductorarranged Vto cooperate with the inductively coupled coils of the vehiclecarried inductor and a circuit devoid of an energy source for saidroadside inductor operable When openforiproducing in said .vehiclecarried coupledcoils a condition to trip said trip relay and operableWhenclosed for producing in the coupled coils a condition to reset saidreset relay.

39. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary of cwhich is connected to said source of energy, a relay connected to thesecondary of said coils, and a second relay connected to the primary ofsaid coils; and'roadside mechanism comprising a roadside'inductorarranged to cooperate with the inductively coupled coils of the vehiclecarried inductor and circuit means for said roadside inductorselectively operable for producing in said vehicle carried coupled coilseither a conditionxto operate said first relay or a condition to operatesaid second relay.

40. In combination, vehicle carried'apparatus comprising a source ofenergy, an inductor includinginductively coupled coils the primary ofwhich is connected to said source of energy, a trip relay connected tothe secondary of said coils, andv areset relay connected to the primaryof said coils, saidreset relay having Iield and armature coils phased 90electrical degrees apart; and roadside mechanism comprising a roadsideinductor arranged to cooperate With the inductively coupled coils of thevehicle carried inductor and a circuit for said roadside inductorselectively 'operable for producing Vin said vehicle carried vcoupledcoils either a condition to tripV said trip relay or a condition tochange the phase relations Vin the relay eld and armature coils tooperate saidreset relay.

4l. In combination, vehicle carried apparatus comprising a source 'ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected in circuit to said source of energy, a trip relayconnected in circuit to the secondary of said coils, and a reset relayconnected to the primary of said coils, the primary circuit lceing'tunedto a resonant frequency somewhat higher than the frequency of said A. C.source'and the second- Vary circuit'being tuned to a frequency somewhatlower than the'frequency of said A. C. source; and roadside mechanismcomprising a roadside inductor arranged to cooperate with theinductively coupled coils of the Vehicle carried inductor and circuitmeans for said roadside inductor selectively operable for producing insaid vehicle carried coupled coils either a condition tooperate'saidtrip relay or a condition to operate said reset relay.

`42. In combination, Vehicle carried `apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected to'said source of energy, a trip relay connected incircuit to the secondary of said coils, and a reset relay connected incircuit to the primary of said coils, the said second relay having afield coil in serieswith and an armature coil in parallel' to theprimary inductor coil; the primary IQU IID

Vzo

. 1,929,979` circuit being tuned to a resonant frequency somey whathigher than the frequency ofV said A. C. source and the secondarycircuit being tuned to a frequency somewhat lower than the frequency ofsaid A. C. energy source.

43. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected to said source of energy, a trip relay connected incircuit to the secondary of said coils, and a reset relay connected incircuit to the primary of said coils, the primary circuit being tuned toa resonant frequency somewhat higher than the frequency of said A. C.source and the secondary circuit being tuned to a frequency somewhatlower than the frequency of said A. C. energy source.

44. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is connected to said source of energy, a relay connected incircuit to the secondary of said coils, and a second relay connected incircuit to the primary of said coils, the primary circuit being resonantto substantially the frequency of said source of energy.

45. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich is Yconnected to said source of energy, a relay connected incircuit to the secondary of said coils,

" and a second relay connected in circuit to the primary of said coils,the secondary circuit being made resonant to substantially the frequencyof said source of energy.

. 46. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor includmary of said coils, said second relay havingfield ing inductively coupled coils the primary of which is connected tosaid source of energy, a relay connected in circuit to the secondary ofsaid coils, and a second relay connected in circuit to the priandarmature coils phased 90 electrical degrees apart.

47., In combination, vehicle carried apparatus comprising a source ofenergy, an inductor including inductively coupled coils the primary ofwhich 55. circuit resistance.

is connected to said source of energy, a relay connected in circuit tothe secondary of said coils, and a second relay connected in circuit tothe primary of said coils, the said second relay having a eld coil inseries with and an armature coil in parallel to the primary coil, andthe quotient of the resistance and reactance of said primary coil beingmade substantially equal to the quotient of the armature circuitreactance and the armature 48. In combination, vehicle carriedapparatus, a vehicle carried inductor means operable for producing aresetting operation in said vehicle carried apparatus, and a singleroadside inductor cooperating with said vehicle carried inductor means,said roadside inductor embodying a circuit devoid of an energy sourceand operative when closed for affecting the Vehicle carried inductormeans to produce the resetting operation thereof, during the time ofcooperation between the vehicle carried inductor means and said roadsideinductor; and means for delaying the release of said resettingoperation.

49. In combination, vehicle carried apparatus comprising an A. C. sourceof energy, an inductor connected in circuit to said source of energy, arelay having field and armature coils arranged in said circuit, and arelease delaying means for said relay; and roadside mechanism comprisinga roadside inductor arranged to cooperate with the vehicle carriedinductor and a circuit for said roadside Ainductor devoid of an energysource and operative when closed for aiecting the vehicle carriedinductor to produce an operation of the said relay. 50. In combination,vehicle carried apparatus comprising an A. CL source of energy, aninductor connected in circuit to said source of energy and a two-elementrelay in said circuit, one element of `said relay being in series withand the other element of said relay being in parallel to the saidinductor, and a release delaying means for said relay.

51. In combination, vehicle carried apparatus*- comprising a source ofenergy, aninductor including inductively coupled coils the primary ofwhich is connected to said source of energy, a trip relay connected tothe secondary of said coils, a reset relay connected to the primary ofsaid coils and a rrelease delaying means vfor said reset relay; androadside mechanism comprising a roadside inductor arranged to cooperatewith the inductively coupled coils of the vehicle carried inductor andcircuit means for said roadside inductor selectively operable forproducing in said vehicle carried coupled coils either a condition tooperate said trip relay or a condition to operate said reset relay. v

52. In combination, vehicle carried apparatus including an A. C. sourceof energy, avehicle Acarried inductor means energized from said sourceof energy and operable for producing an operation in said vehiclecarried apparatus, and a single roadside inductor cooperating with saidvehicle carried inductor means,said roadside inductor embodying acircuit devoid of an energy source and operative when closed forvchanging the phase relations of the current and voltage effective insaid vehicle carried inductor means for producing the said operationthereof.

53. In combination, vehicle carried apparatus including an A. C. sourceof energy, a vehicle carried inductor connected in circuit to saidsource of energy and operable for producing an operation in, saidvehicle carried apparatus, saidv circuit being tuned, and a roadsideinductor co-v operating with said vehicle carried inductor means, saidroadside inductor embodying a correspondingly tuned circuit devoid ofvan energy source and operative when closed for changing the phaserelations of the current and Voltage effective in said vehicle carriedinductor means for producing the said operation thereof.

54. In combination, vehicle carried apparatus including an A. C. sourceof energy, a Vehicle carried inductor means comprising inductivelycoupled coils energized from said source of energy and operative forcontrolling said vehicle carried apparatus, and a single roadsideinductor cooperating with the inductively coupled coils, said roadsideinductor embodying a circuit devoid of an energy source and operativewhen open for producing a tripping condition in said vehicle carriedinductor means and operative when closed for changing the phaserelations of the current and voltage eifective in said vehicle carriedinductor means for producing another operationin said apparatus.

55. In combination, vehicle carried apparatus comprising an alternatingcurrent sourceY of energy, an inductor including inductively coupledcoils, the primary coil of which is connected in circuit to said sourceof energy and the secondary coil of ywhich is wholly energized from saidprimary coil, and a relay in said primary circuit; and

means for aiiecting said coils to operate said relay.

5,6. In, combination, vehicle carried apparatus comprising analternating current source of energy, an inductor including inductivelycoupled coils, they primary of which is connected in circuit to saidsource of energy and the secondary of which isrenergizedwholly from saidprimary, andl @55 comprising a source ofrenergy, an inductor includi'nginductively coupled coils, the primary of which is connected in circuitvto said source of energy, and a relay in said circuit; and roadsidemechanism comprising a roadside inductor arranged to cooperate with thevehicle carried inductor and a circuit for said roadside inductor devoidof an energy source and operative when closed for affecting said vehiclecarried inductor to operate said relay. n

59. In combination, vehicle carried apparatus comprising a source ofenergy, an inductor connected in circuit to said source of energy and arelay in said circuit; and roadside mechanism comprising a roadsideinductor arranged to cooperate with Vthe'vehicle carried inductor and acircuit for said roadside inductor devoid of an energy source andoperative when closed for producing a power change in the vehicle.carried inductor'to operate said relay.

60. In combination, an inductor including inductively coupled primaryand secondary coils, a relay connected in circuit to said primary coil,a second relay connected in circuit to said secondary coil, and meansfor influencing said inductor to selectively operate said relays.

6l. In combination, an inductor including inductivelycoupled primary andsecondary coils, a reset-operating relay connected in circuit toY saidprimary coil, a trip operating relay connectedin 1 circuit to saidsecondary coil, vand means for iniipencing said inductor to Vselectivelyoperate said relays. Y

62. In combination, vehicle carried apparatus including an inductorincluding inductively cou- 1^ pled primary and secondary coils, a relayconnected in circuit to said primary coil, a second relay connected incircuit to said secondary coil, and means for iniluencing said inductorto selectively operatey said relays. f

63. In combination, an inductor including inductively coupled primaryand secondary coils, a relay connected in circuit to said primary coil,a second relay connected in circuit to said secondary coil, and roadsideinductor means for influencing said inductor'to selectively operate saidrelays.

64. In combination, an inductor including inductively coupled primaryand secondary coils, a relayconnected in a tuned circuit to said primarycoil, a second relay connected in a tuned circuit to said secondarycoil, and means for iniiuencing saidinductor to selectively operate saidrelays.

65.. In combination, vehicle carried apparatus comprising an inductor, atrip relay connected in circuit to said inductor, a reset relayconnectedin circuit to said inductor and roadside apparatus including aninductor operative for iniiuencing the vehicle carried inductor forselectively operating said trip and reset relays.

66. In combination, vehicle carried apparatusv comprising an inductor, atrip relay connected in circuit to said inductor, a reset relayconnectedv in circuit to said inductor and roadside apparatus includingan inductor having a circuit devoid of an energy source operative forinfluencing the vehicle carried inductor for selectively operating saidtrip and reset relays.

67. In combination, vehicle carried apparatus. comprising an inductor, atrip relay connected in a tuned circuit to said inductor, a reset relayconnected in atuned'circuit to said inductor and roadside apparatusincluding an inductor operative for influencing the vehicle carriedinductor', for selectively operating said trip and reset relays.

68. An induction train control system comprising vehicle carriedapparatus, av vehicle carried inductor means including an energytransmitting element and an energy receiving element coupled togetherand operative for tripping and resetting the vehicle carried apparatus,the tripping being eected upon a reductionof transmission of energybetween the coupled elements, and roadside inductor means cooperatingWith the vehicle carried inductor means and comprising a single inductorelement cooperable inductively with the vehicle carried coupled elementsand circuit means devoid of any energy source governing said singleinductor element for selectively producing therein tripping andresetting 'indications to selectively effect tripping and resettingoperations of the vehicle carried inductor means. y

69. An induction train control system comprisinga controlling relay, avehiclecarried inductor means including an energy transmitting elementand an energy receiving element coupled together, said energy receivingelementl being connected to said controlling relay and said elementsbeing operative for tripping and resetting the controlling relay, thetripping being effected by substantially deenergizing said relay, androadside inductormeans cooperating with the vehicle carried inductormeans and comprising a single inductor element cooperable inductivelyWith the vehicle carried coupled elements and circuit means devoid of anenergy source governing said single inductor element for selectivelyproducing therein tripping and resetting indications to selectivelyeffect tripping and resetting operations of the vehicle vcarriedinductor means.

70. An induction train control system, comprising vehicle carriedapparatus, a vehicle carried inductor means including an energytransmitting element and an energy receiving element coupled togetherand operative for tripping and resetting rit iso

producing therein a resetting indication transmittable to for effectinga resetting operation of said vehicle carried inductor means.

71. An induction train control system comprising a governing relay, avehicle carried inductor means including an energy transmitting elementand an energy receiving element coupled together, said energy receivingelement being connected to said controlling relay and said elementsbeing operative for tripping and resetting the said relay, a roadsideinductor means cooperating with the vehicle carried inductor means andcomprising LESTER L. JONES.

